used if different values for a certain attribute map to different HTML tags

HTML tag

HTML tag this node type is converted from/to

Valid parents

Node types that this type can have as its parent. * means any, - means none

Valid children

Node types that this type can have as its children. * means any, - means none

Other attributes

Attributes that have a special meaning for this node type, if any

Properties (annotations only)

Properties in annotation.data

Rendering

Whether the editor renders nodes of this type correctly

Editing

Whether the user can edit the contents of this node type. For annotations, this means the user can edit text with this annotation and change the annotation's properties if any

Creating

Whether the user can create new nodes of this type. For annotations, this means the user can apply this annotation to existing text

Saving

Whether a node of this type will be converted back to wikitext correctly. This can be true even for non-editable nodes if they round-trip correctly. A "no" in this column means even untouched nodes of this type don't round-trip correctly

These aren't nodes, they're JSON objects, but they do correspond to HTML tags. Annotations can be applied to individual characters in a text node and to other content nodes, but not to non-content nodes. Attribute types are denoted as type/subtype.